<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>404 Not Found</title>
    <style>
        body { margin: 0; padding: 20px; font-family: sans-serif; text-align: center; }
        h1 { font-size: 8em; margin: 50px 0; color: #333; }
        p { font-size: 1.2em; color: #666; }
    </style>
</head>
<body>
    <h1>404</h1>
    <p>页面未找到</p>
    <p><a href="/">返回首页</a></p>
</body>
</html>